Some plants that are processed into foods often contain natural
substances that may be hazardous to human health. One example is
coumarin, which is known to cause liver and kidney damage in rats, mice
and probably humans. The main source of coumarin in the diet is
cinnamon. The name 'cinnamon' is correctly used to refer to Ceylon
cinnamon, also known as 'true cinnamon'. However, other plant species
are sometimes sold with the label of cinnamon. This is the case of
Cinnamomun aromaticum (cassia).

Lungarini S, Aureli F, Coni E.Coumarin and cinnamaldehyde in cinnamon marketed in Italy: A natural
chemical hazard? Food Addit Contam. 2008 Jun 20:1-9  

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